diff --git a/src/requests/structures.py b/src/requests/structures.py
index 188e13e482..373add3b9c 100644
--- a/src/requests/structures.py
+++ b/src/requests/structures.py
@@ -6,6 +6,7 @@
 """
 
 from collections import OrderedDict
+from collections.abc import MutableMapping
 
 from .compat import Mapping, MutableMapping
 
@@ -77,7 +78,10 @@ def copy(self):
         return CaseInsensitiveDict(self._store.values())
 
     def __repr__(self):
-        return str(dict(self.items()))
+        return str({k: v for k, (casedkey, v) in self._store.items()})
+
+    def lower_items(self):
+        return ((k.lower(), v) for k, (casedkey, v) in self._store.items())
 
 
 class LookupDict(dict):